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Add gradient feature. #164

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243990f
Add gradient feature.
aurium Oct 21, 2019
d4c4e61
Lint it!
aurium Oct 21, 2019
3b9a08b
Do not limit the user
aurium Nov 5, 2019
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71 changes: 71 additions & 0 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -384,7 +384,78 @@ Color.prototype = {
w1 * color1.green() + w2 * color2.green(),
w1 * color1.blue() + w2 * color2.blue(),
color1.alpha() * p + color2.alpha() * (1 - p));
},

gradientRGB: function (toColor, steps) {
if (!toColor || !toColor.rgb) {
throw new Error('Argument "toColor" was not a Color instance, but rather an instance of ' + typeof toColor);
}
if (steps < 2) {
throw new Error('Argument "steps" must to be bigger or equal to 2.');
}
toColor = toColor.rgb();
var fromColor = this.rgb();
var [fR, fG, fB] = fromColor.color;
var [tR, tG, tB] = toColor.color;
var fA = fromColor.alpha();
var tA = toColor.alpha();
var incR = (tR - fR) / (steps - 1);
var incG = (tG - fG) / (steps - 1);
var incB = (tB - fB) / (steps - 1);
var incA = (tA - fA) / (steps - 1);
var gradient = [fromColor];
for (var i = 1; i < steps; i++) {
gradient.push(Color({
r: Math.round(fR + incR * i),
g: Math.round(fG + incG * i),
b: Math.round(fB + incB * i),
alpha: fA + incA * i
}));
}
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return gradient;
},

gradientHSL: function (toColor, steps, rotationWay) {
if (!toColor || !toColor.hsl) {
throw new Error('Argument "toColor" was not a Color instance, but rather an instance of ' + typeof toColor);
}
if (steps < 2) {
throw new Error('Argument "steps" must to be bigger or equal to 2.');
}
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if (!rotationWay) {
rotationWay = 1;
}
if (rotationWay.constructor !== Number || isNaN(rotationWay) || rotationWay === 0) {
throw new Error('Argument "rotationWay" must to be a non zero number.');
}
toColor = toColor.hsl();
var fromColor = this.hsl();
var [fH, fS, fL] = fromColor.color;
var [tH, tS, tL] = toColor.color;
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var fA = fromColor.alpha();
var tA = toColor.alpha();
if (rotationWay > 0 && fH > tH) {
tH += 360;
}
if (rotationWay < 0 && fH < tH) {
tH -= 360;
}
var incH = (tH - fH) / (steps - 1);
var incS = (tS - fS) / (steps - 1);
var incL = (tL - fL) / (steps - 1);
var incA = (tA - fA) / (steps - 1);
var gradient = [fromColor];
for (var i = 1; i < steps; i++) {
gradient.push(Color({
h: Math.round(fH + incH * i),
s: Math.round(fS + incS * i),
l: Math.round(fL + incL * i),
alpha: fA + incA * i
}));
}
return gradient;
}

};

// model conversion methods and static constructors
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47 changes: 47 additions & 0 deletions test/index.js
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Expand Up @@ -657,6 +657,53 @@ it('Mix: 100%', function () {
equal(Color('#f00').mix(Color('#00f'), 1.0).hex(), '#0000FF');
});

it('Gradient in RGB', function () {
deepEqual(Color('#f10').gradientRGB(Color('#02f'), 5).map(c => c.string()), [
'rgb(255, 17, 0)',
'rgb(191, 21, 64)',
'rgb(128, 26, 128)',
'rgb(64, 30, 191)',
'rgb(0, 34, 255)'
]);
});

it('Gradient in RGBA', function () {
deepEqual(Color('#f30').gradientRGB(Color('#04f').alpha(0), 5).map(c => c.string()), [
'rgb(255, 51, 0)',
'rgba(191, 55, 64, 0.75)',
'rgba(128, 60, 128, 0.5)',
'rgba(64, 64, 191, 0.25)',
'rgba(0, 68, 255, 0)'
]);
});

it('Gradient in HSL', function () {
deepEqual(Color('#f00').gradientHSL(Color('#080'), 4).map(c => c.string()), [
'hsl(0, 100%, 50%)',
'hsl(40, 100%, 42%)',
'hsl(80, 100%, 34%)',
'hsl(120, 100%, 27%)'
]);
});

it('Gradient in HSLA', function () {
deepEqual(Color('#f00').gradientHSL(Color('#080').alpha(0.85), 4).map(c => c.string()), [
'hsl(0, 100%, 50%)',
'hsla(40, 100%, 42%, 0.95)',
'hsla(80, 100%, 34%, 0.9)',
'hsla(120, 100%, 27%, 0.85)'
]);
});

it('Gradient in HSL counterclokwise', function () {
deepEqual(Color('#f00').gradientHSL(Color('#080'), 4, -1).map(c => c.string()), [
'hsl(0, 100%, 50%)',
'hsl(280, 100%, 42%)',
'hsl(200, 100%, 34%)',
'hsl(120, 100%, 27%)'
]);
});

it('Level', function () {
equal(Color('white').level(Color('black')), 'AAA');
equal(Color('grey').level(Color('black')), 'AA');
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